Display technology for automotive...

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Display technology for automotive

application

Jun ChenSr. manager for display technology

TPO Display Corporation

Nov 10th, 2008

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Content

� Displays in a car.

� Special requirements for automotive

� Different display technologies for automotive.

� Passive LCDs

� TFT LCDs

� LTPS and SOP

� Reconfigurable cluster

� Shaped display

� Dual view display

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Displays in a car- key applications

Mid console display

Rear Seat Entertainment

Driver Information Systems

Head-up display

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Display in a car - Instrument cluster

Audi A8 Cluster DisplayAudi A6 Cluster Display

� Driver information system in instrument cluster

� Driver information, GPS, camera

� Passive, TFT, OLED

� Transmissive, transflective, mostly use negative display mode.

� Shaped display, display with hole.

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� Center information display in mid console

� Audio/Video, climate control, telecom, GPS, camera

� Passive, TFT, OLED

� Transmissive, transflective,

� Duel view.

� Cluster in the center.

Display in a car – mid console

VW Golf V Radio Display Peugeot/Citroen/Fiat

Navigation display

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Display in a car – Rear seat entertainment

� Video entertainment display for rear seat.

� DVD player

� TFT.

Volvo XC90 RSE Display

GM (GMT201) RSE Display

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2012 requirements and mind set

Apix system-Automotive Pixel Link

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APIX – Automotive Pixel Link

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Special requirements for automotive

- Lifetime and durability

� Life time:� 15000 ~ 20000 hrs operation.

� 10 years or 100,000 hrs environmental exposure.

� Humidity:� Just no water condensation allowed.

� AHTO: 60°C/90%RH 504 Hrs, 65°C/93%RH 504 Hrs

� High reliability requirement:� CE 240 hrs -> Auto 504 hrs, even 1000 hrs.

� Life time of back light:� End of life definition : <50% of normal brightness, some

customer even asked for < 80%.

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� Temperature range:

� Storage temperature :

-40ºC � 90ºC, 95ºC, 105ºC

� Functional temperature, readable:

-40ºC, -30 ºC � 85ºC ~ 95ºC

� Operational temperature, meet spec. (acceptable performance) :

-40ºC, -30 ºC� 70ºC ~ 85ºC

� Module is heated up by itself.

- Backlight (major).

- Electronics(minor).

- Normally the temp of panel and optical foil will be 10~20ºC higher than

ambient temp.

- Power derating needed at high temp(>~70ºC).


- Summer and winter

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- Day and night� Daylight performance and sunlight readability:

- High brightness, > 400 ~ 600 cd/m2 for TFT module.

- Alternative solution: transflective (TF) display, brightness 350 cd/m2

- Anti-glare and Anti-reflectance surface coating.

- Sunglass visibility.

� High FoS performance required at night:

- NB display mode is preferred.

- Black background is really black at all viewing angles:

high CR (>1000:1) and good view angle (VA and IPS needed).

- Very sensitive for defects of display:

Non-uniformity, cross-talk, cosmetic defects, etc.

- Backlight dimming is required, dimming ratio, > 200:1

- Light control film used to eliminate windshield reflection.

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- Environment

� Vibration:

Vibration and shock test needed, even at diff temp.

� EMC:

EMC, ESD, and EMI.

� Display surface:

Anti-Scratch, hardness >=3H.

Chemical resistance.

� Anti-dust.

� Environment friendly:

� RoHS.

� Design for recycling.

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- Quality

� Product rejection ratio < 100 PPM, target 0 PPM.

� TS16949 needed.

� ACE Q100/200 is more and more required for

electronics components.

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- Wow for interior

� Hidden display:

� High CR and very wide viewing angle.

� Adding smoke glass in front of the display with <50%

transmission.

� Touch panel,

Glass to glass type -> glass to film type -> capacitor type.

� Curve display.

� Shaped display.

� Duel view

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Display for auto-PLCD

� Passive LCDs are widely used for auto:

� TN, FSTN, DSTN, ASTN, dye-STN, VA type.

� Cheap solutions.

� Market share decreasing comparing with TFT, but estimated still

lasting for a long time.

LC

glass

glass

pola

pola

SiO2

ITO

TCPI

STNSTNHTNTNType of

display

24018012090Twist angle

of LC layer

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Display for auto-TFT

CF (Color

Filter)

LC

Array

Back Light

+ PCB

Cell -

PanelModule

Polarizer

Polarizer

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Display for auto-LTPS

� SOP(system on panel):

Single chip solution

for 12.3” 1280X480.

� Higher aperture ratio.

� Higher reliability due

to less output terminals.

� On panel light and

temp sensor.

� Integration touch panel.

Source DriverSource Driver

Gamma

+

Correction

(adjustable

Gamma

+

Correction

(adjustable

Scan Driv

er

Scan Driv

er

Interfa

ce

Interfa

ce

TconGen.

TconGen.

VCOM

Driver

VCOM

DriverDCDC(for DD)

2VDD/-VEE

DCDC(for DD)

2VDD/-VEE

Active Region

DCDC (fo

r SD)

3VDD/-2

VSS

DCDC (fo

r SD)

3VDD/-2

VSS

Low Voltage High Speed I/FLow Voltage High Speed I/F

ALSALS

ATS

RegulatorRegulator

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Display for auto-Reconfigurable cluster� Reconfigurable cluster (one display cluster)

� 12.3”, 1280X480

� High brightness, >1000 cd/m2

� Fast response time, ~ 7ms.

� Cross models platform.

Jaguar XJ

Mercedes-Benz F 700

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Display for auto-Shaped display

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Display for auto-Duel view display2

1

1 2

driver passenger

X

L

unwantedsecondaryview

primary view

view 1: navigation infoview 2: e.g. DVD video

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